Tantalum Capacitor


Tantalum Capacitors are electrolytic capacitors that use a material called tantalum for the electrodes. Large values of capacitance similar to aluminum electrolytic capacitors can be obtained. Also, tantalum capacitors are superior to aluminum electrolytic capacitors in temperature and frequency characteristics. In comparison with aluminum electrolytic capacitors, they are for similar capacitance and volume ratings generally more expensive, with lower effective series resistance. They usually have longer life, especially at moderately elevated temperatures. For surface mount devices, they are generally smaller.

Tantalums exploit the tendency of tantalum to form a protective oxide surface layer. They use tantalum powder, pressed into a pellet shape, as one "plate" of the capacitor with the oxide as the dielectric, and an electrolytic solution or conductive solid as the other "plate". Because the dielectric layer can be very thin (thinner than the similar layer in, for instance, an aluminum electrolytic capacitor), a high capacitance can be achieved in a small volume. Once tantalum powder is baked in order to solidify it, a crack forms inside the unit. An electric charge can be stored on this crack. Because of the size and weight advantages, tantalum capacitors are useful in portable telephones, pagers, personal computers, and automotive electronics.

In tantalum capacitor manufacturing, there is a steam pyrolysis process where tantalum pellets are decomposed by steam. Humidity control in this process is important to maintain product quality and improve yield. Stable humidity measurement at high temperatures of 200 to 400 °C is required. The ZR402G/HS Direct In Situ Zirconia High Temperature Humidity Analyzer is easy to maintain as it requires no sampling system and utilizes a long life sensor with fast response. It is widely used in humidity instrumentation applications and has been well received in the marketplace.

Steam Pyrolysis Process in Tantalum Capacitor Manufacturing


A tantalum pellet with an electrode plate applied is immersed in a manganese nitrate solution. This dipping process allows the manganese nitrate to penetrate the porous part of the pellet. After dipping, the pellet is forwarded to the pyrolysis process where the manganese nitrate is decomposed under high temperature and humidity conditions to form a manganese dioxide coating by the reaction Mn(NO3)2 -> MnO2 + 2NO2. These steps are repeated until the coating is sufficient. To improve the coating uniformity and yield, the humidity is controlled.

  • Maintains the quality of the tantalum capacitor manufacturing process
  • Ensures stable, continuous humidity measurement
  • Reduces operating costs

Field Data

Inside the steam pyrolysis furnaceMeasurement point: Inside the steam pyrolysis furnace

Temperature: 200 to 400°C

Pressure: 10 to 20 Pa
Humidity: 25 to 80 volume % H2O

Product Recommendations

ZR22 Oxygen Detector

ZR22R Probe Protector

ZR402 Oxygen analyzer
AV550 Oxygen Averaging Analyzer

MC1 Single channel manual calibration unit
AC1 Single channel automatic calibration unit
IAC24 Integral automatic calibration unit
AC4/AC8 Multi channel automatic calibration unit


As the sensor inside a pyrolysis furnace is hot, it can be easily damaged if cooler water drips onto it. The sensor should be installed with the probe head pointing downward. For more information contact your local Yokogawa Analytical Marketing Department.


  • Energía

    A mediados de la década de 1970, Yokogawa inició su participación en el negocio de la energía con el lanzamiento del Sistema de control eléctrico EBS. Desde entonces, Yokogawa ha continuado firmemente con el desarrollo de nuestras tecnologías y capacidades para proveer los mejores servicios y soluciones a nuestros clientes en todo el mundo.

    Yokogawa ha operado la red de soluciones de energía globales para jugar un papel más activo en el dinámico mercado de energía global. Esto ha hecho un posible un trabajo en equipo más unido dentro de Yokogawa, el cual conjunta nuestros recursos globales y nuestra especialización en la industria. Los expertos en el sector de energía de Yokogawa trabajan juntos para brindar a cada cliente la solución que se adapta mejor a sus requerimientos sofisticados.

    Leer Más

Productos y Soluciones Relacionadas

  • IAC-24

    The IAC-24 is an ultra compact device that mounts directly onto the ZR22G or ZR202G zirconia detector. It is used to calibrate a single detector. The unique mounting configuration is designed to minimize installation time, wire pulls and tubing runs that are typical with auto calibration.

    Leer Más
  • Multi Channel Oxygen Analyzer System ZR22/AV550G

    The AV550G Multi Channel Oxygen Analyzer System allows for measurements on up to eight ZR22 probes simultaneously. The ZR probe's in-situ measurement method does not require any process conditioning or extractive sampling, reducing maintenance costs and resulting in faster measurement response to changes in the process.

    Leer Más



¿Tiene Dudas?

Contacte a un Experto de Yokogawa y conozca como podemos ayudarle a resolver sus retos.